Remote-processing BASIC for the CX-10 Modbus Uživatelský manuál stáhnout pdf (Strana 24)

BASIC PROGRAMMING GUIDE

2-15

DO-UNTIL

Syntax: DO

{program statements}

UNTIL

relational expr

Where:

relational expr

is any logical evaluation such as =, <, >, etc.

Function: Executes a number of program statements a relational expression is true.

Mode: Run

Use: 100 A=0 : DO : A=A+1 : PRINT A : UNTIL A=4 : PRINT "Done"

DESCRIPTION

This statement always executes at least once. DO-UNTIL loops may be nested. This loop may be exited

without meeting

relational expr

by executing a CLEAR or CLEAR S statement.

This statement always executes to UNTIL once. When

relational expr

is evaluated and if it is false, program

flow branches back to DO. If true, program resumes at the next statement after UNTIL.

When there are no {program statements} between DO and UNTIL, and {relational

expr

} is false, the "loop"

will repeat forever, or until a <ctrl-c> is typed at the console.

DO-UNTIL and DO-WHILE loops can be nested.

DO-WHILE, FOR-TO-NEXT-STEP

ERROR

BAD SYNTAX When relational

expr

is omitted

EXAMPLE

The following program stays in a DO-UNTIL loop until a line has changed.

10 ON LINE 0,0,500

20 DO

30 UNTIL C=1

40 PRINT "Line 0 changed. Is now a",line(0)

50 C=0

60 GOTO 20

500 C=1

510 RETURN

>run

Line 0 changed. Is now a 0

Line 0 changed. Is now a 1

Line 0 changed. Is now a 0

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 ... 83 84

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